From: Will Deacon will@kernel.org
commit 0d7fd70f26039bd4b33444ca47f0e69ce3ae0354 upstream.
Handling of the CPU_PM_ENTER_FAILED transition in the Arm PMU PM notifier code incorrectly skips restoration of the counters. Fix the logic so that CPU_PM_ENTER_FAILED follows the same path as CPU_PM_EXIT.
Cc: stable@vger.kernel.org Fixes: da4e4f18afe0f372 ("drivers/perf: arm_pmu: implement CPU_PM notifier") Reported-by: Anders Roxell anders.roxell@linaro.org Acked-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/perf/arm_pmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/perf/arm_pmu.c +++ b/drivers/perf/arm_pmu.c @@ -804,8 +804,8 @@ static int cpu_pm_pmu_notify(struct noti cpu_pm_pmu_setup(armpmu, cmd); break; case CPU_PM_EXIT: - cpu_pm_pmu_setup(armpmu, cmd); case CPU_PM_ENTER_FAILED: + cpu_pm_pmu_setup(armpmu, cmd); armpmu->start(armpmu); break; default: